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(No Modem E. WESTON. REGULATOR ECE DYNAMC 0E MAGNET() ELECTRIC MACHINES. No. 289,325. Patented Nov. 27, 1883.

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Sterns tls-irren Parent @ra-ic] o EDlVARI) WESTON, OF NElVi-XIZK, NEV JERSEY, ASSIGNOR T() .lllll lNllEl) S'li-'XTES ELEC'IRIC LIGHTING COMPANY, OF XEV YORK, Y.

REGULATOR FOR DYNAMO OR MAGNET@ ELECTRIC h/lACl-HNES.

SPECIFICATION forming part of Letters Patent No. 89,325, dated November 27, 1883.

Application filed July 1li, 18.23.

Be it known that l', Enwxnn ll'ns'rox, a subject of the Queen of Great Britain, residing` at Xewark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Regulators for Dynamo or )Iagneto Machines, of which the followingis a specification, reference being had to the drawing' accompanying and forming a part of the same.

My present invention pertains to systems for controlling or regulating the current developed by two or more dynamo or magneto electric machines when connected up in series and run conjointly for such purposes as elec tric-are lighting, or the like, where it is desirable to produce a high electro-motive force and to maintain at all times a constant or uni form tlow of current.

In the machines which I have invented and employ, the armature and iield circuits l ot' a machine, when rnn alone, are in 'deril vation. To regulate the current of a single machine, therefore, I include in the derived held-circuit a variable resistance, and in the main or armature circuit an electro-magnet, which, through the instrumentality of any proper mechanism, is caused to vary the resistance, so as to preserve a uniform flow of current on the line. lVhen two or more machines are connected in series, however, for producing a higher electro-motive force, the limits of regulation are greatly extended, and obstacles arise in the way ot' effecting the regulation on this principle which add to the expense and difficulty of maintaining a uniform current. I have overcome these diiilculties by certain methods of regulation, whichI have described in other applications for Letters Patent, and also by the plan which forms the subject of this application, and which I will now describe by reference to -the accompanying drawing, which is a diagram of a system invented by me.

Let A A designate an electric circuit, and I B a given number of arcJa-mps or other electrical devices included in series in said circnit. In order to run the lamps properly, it

may be necessary to connect up several generators in series, in which case l provide for the regulation ofthe current in the following manner:

C C C designate a given number of generators with their armatures connected up in series with the line A A. The field-circuits of these machines are independent ofthe armature-circuits, and are connected in series with a circuit, D, in which is included a dynamo, E, which, for convenience, is designated the exciterf7 rIhis latter machine has a iieldcircuit of relatively high resistance, which is in derivation to its armature-circuit, and at some point in the derived field-circuit- I1 is inclnded a variable resistance, G. In the main circuit A is an electro-magnet, II, the armature of which is connected with mechanism of any proper or well-known description for operating or varying the resistance G by introducing more resistance in the circuit E as the attraction of the magnet increases, and conversely. IVi th this arrangement, if the resistance ot' the main line shonld be decreasedas, for example, by the withdrawal of one or more ofthe lamps-the tendency to an increase of current is prevented by the action of the magnet H, which operates to interpose more resista-nce in the circuit I", and thereby rednce the amount ot' current produced by the exciter E, and, consequently, to weaken the fields ofthe series of machines C C sufficiently to maintain the ilow of current uniform. The converse of this of course occurs whenthe current on the main line weakens, as by the insertion of more resistance. In this way a single electro-magnet and resistance or rheostat is rendered capable of controlling the current from a number of powerful,generators.

In practice it is desirable to employ, in lieu of thesimple electro-magnet H and the resist` ance G, a rheostat operated by some means independent of the magnet, and only controlled by the varying attractive power of the magnet. Such devices are now used for purposes analogous to the present, an efficient form of the same being described in apatent granted to me, No. 278,640, May 29, 1883.

Having now described my invention, and reserving the right to make subject of otherl applications features of novelty herein shown 3. In a system of electric-aro lighting, the

or described but not claimed, what I now claim is l. The combination, with two or moreelectrical generators, having their armatures and ield-eoils connected in series in independent Circuits, of a generator in the field-Circuit, an electro-magnet in the main. circuit in series with the armatures of the generators, and means operated or controlled thereby for varying the current in the field-circuit, substantially as herein set forth.

2. The combination, with two or more eleotrieal generators, having their field and arma ture coils connected in series in independent circuits, of a derived field-circuit generator in the field-circuit, a variable resistance in said derived field-circuit, and an electro-magnet in the main circuit in series with the armatures of the generators for varying the said resistance, as and for the purpose specified.

combination of a main circuit, lamps eonneeted in series therewith7 two ormore generators with their armature-coils connected up in series with the lamps, an independent eircuit including the field-magnet coils of the generators in series, a derived field-circuit generator for energizing the said iields, avaril able resistance or rheostat in the derived eld- EDVARD VESTON.

.v'itnessesz HENRY A. BncKMnYEn, L. V. E. INNEs. 

